Arcee was held in reserve as NEST entered Shanghai to deal with Demolishor, only being called into action when the presence of a second Decepticon, Sideways, was detected. Together with the twins, Arcee pursued the sneaky speedster through the streets of Shanghai, smashing through buildings and everything else in her way, but ultimately, none of her three components were able to do much damage, so Sideswipe was brought up to bat, and he quickly put the Decepticon down.While not on missions, Arcee was parked with the other Autobots in their hangar at Diego Garcia. It was here that the Autobots received word from the President of the United States, via Director Galloway, that the White House was concerned that the Autobots' living on Earth was the reason for the Decepticon activity, and that if need be, they would ask the Autobots to leave. Later, after Optimus Prime died in battle and The Fallen issued an ultimatum to Earth, the US government decided that the Autobots would be shipped back to Diego Garcia.NEST had a different idea, and instead shipped Arcee and the other Autobots to Egypt on the advice of Sam Witwicky, who had the means to resurrect Optimus Prime. During the climactic battle between NEST and The Fallen's Decepticons, Sam and Mikaela attempted to make their way through the bombed-out Egyptian town that had become the battlefield. Arcee arrived with Ironhide to escort them through the warzone, as tf wiki states